Fatal error installing Site Wide Text Change

Hi there,

I'm using a new multisite install and was trying to install the WPMU Dev plugin:
Site Wide Text Change

However, when I try to Network install it I get this:

Plugin could not be activated because it triggered a fatal error.
Fatal error: Cannot redeclare set_swt_url() (previously declared in /var/www/vhosts/domain.co/httpdocs/wp-content/plugins/ultimate-branding/ultimate-branding-files/modules/site-wide-text-change-files/sitewidetextincludes/classes/functions.php:8) in /var/www/vhosts/domain.co/httpdocs/wp-content/plugins/site-wide-text-change/sitewidetextincludes/classes/functions.php on line 16

Any ideas?